HealthUpdated 2026-04-12

Conception Date Calculator

Estimate a conception date from a due date with an editable offset.

Use YYYY-MM-DD.

days
months

Result

Result date

2025-07-20

Total days changed

-266

Formula Explanation

The tool adds calendar months first, then days, using a UTC date calculation to avoid time-zone drift.

How to Use

  1. Enter the requested inputs.
  2. Keep any editable rule or rate fields aligned with your situation.
  3. Review the result and notes before using the estimate.

Examples

Adjust the defaults to match your scenario, then calculate the estimate.

FAQ

Can I change the assumptions?

Yes. Editable rate and rule fields are included when the exact rule can vary by place, provider, or date.

Is this copied from another site?

No. This page uses an original implementation and rewrites the calculator structure, labels, formulas, and copy.

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